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I don't know much about current locomotives, but back in the day, the engine speed was controlled by a governor. The governor had four solenoids that were energized in various combinations by the amount of voltage applied to that circuit. Starting with 74 volts maximum, as you began to string together more and more units with MU jumpers of various condition between them, you started to get voltage drop. After 8 or 9 units there was a good chance that you wouldn't get enough voltage to the trailing units to get the engine up to the desired speed. <br /> <br />As for anyone who objects to the term "lash-up", they need a little more misery in their lives to give themselves something real to be concerned about. Yeah, I've never heard the term used on the four railroads I spent 36 years working for, but the book of rules always defined it as a "locomotive", regardless of how many units it was made up of, yet whenever you reported a train move or dispatched power from the pad, most people called it a "consist". No matter which term you use, I think we all know what you're talking about.
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